Not your weight, but your waist size matters the most. Doctor explains hidden danger of belly fat

Many people step on the weighing scale to check their health, assuming the number alone reflects their fitness. But doctors say that number can be misleading. What matters more is where the body stores fat. According to a doctor who recently shared insights online, the size of your waist can reveal far more about your long-term health risks than your overall weight. In fact, abdominal fat may quietly signal serious metabolic problems long before the scale shows a major change.

Dr. Shraddhey Katiyar recently took to X to explain why waist circumference often matters more than total body weight. He pointed out that body weight only shows how heavy someone is, whereas the waistline reveals how dangerous certain fat deposits may be. In clinical practice, doctors are often more concerned about where fat accumulates rather than the overall number on the scale.

Belly fat

One of the key concerns is belly fat, particularly visceral fat. This type of fat forms around the abdominal organs, including the liver, pancreas, and intestines. Unlike fat stored just under the skin, visceral fat is metabolically active. It releases inflammatory substances and free fatty acids that can disrupt the body’s metabolic balance. These biological processes increase the risk of insulin resistance, fatty liver disease, and type 2 diabetes.

BMI

The doctor also highlighted a major limitation of Body Mass Index, or BMI. BMI simply calculates weight in relation to height and cannot distinguish between muscle, bone, or different types of fat. As a result, two individuals with identical BMI scores can have very different health risks depending on how their fat is distributed. In many cases, the person with the larger waistline carries a higher metabolic risk even if their BMI appears normal.

Fat accumulation

Central obesity, or fat accumulation around the abdomen, is often one of the earliest indicators of metabolic dysfunction. According to Dr Katiyar, an expanding waistline can predict the development of several chronic conditions. These include type 2 diabetes, hypertension, heart disease, fatty liver disease, and sleep apnea. In some cases, these conditions begin developing years before noticeable weight gain appears on the scale.

Liver health

Abdominal fat can also directly affect liver health. Fat stored around the abdomen drains into the portal vein, which carries blood straight to the liver. This process sends fatty acids directly into the organ, contributing to fatty liver disease, elevated triglyceride levels, and increased glucose production. This biological pathway explains why a larger waist circumference is frequently associated with diabetes and metabolic disorders.

Dr. Katiyar also emphasised that this issue is particularly relevant for people of South Asian origin. Individuals from this region often develop visceral fat even at relatively lower body weights. As a result, someone who does not appear significantly overweight may still carry harmful abdominal fat that increases their risk for metabolic diseases. This pattern is one of the reasons diabetes tends to develop earlier among South Asians compared to many other populations.

To help people assess their risk, he shared simple waist measurement guidelines recommended for Asian populations. For men, a waist circumference above 90 centimetres is considered high risk, while for women the threshold is 80 centimetres. He also shared a practical rule that can help people quickly gauge their risk: the waist measurement should ideally be less than half of a person’s height.

According to Dr Katiyar, these measurements often provide clearer insights in clinical practice than body weight alone. While the weighing scale reflects overall mass, the tape measure can reveal underlying metabolic damage that may otherwise go unnoticed.